Add a lead capture form or button linked to a popup subscription form.
You need to have a lead capture form to capture leads.
A common question with regards to form creation is how many fields it should contain. The fewer, the better. The name and email are usually sufficient. Fewer form fields are better, generally.
Some businesses use multi-page forms to help the transition from user to lead. This can work well in certain circumstances because you’re asking for information only once the prospect has committed.
Again, it depends on your reward(s), audience, and goal. Test the best form type and length.